Appeal 2007-2132
Application 09/761,041
polypyrrolidone (PVPP), continuously centrifuging the main flow of the
thus-treated beer to simultaneously (1) remove the used PVPP therefrom and
(2) to form a separate flow stream consisting of the main flow of stabilized
beer. Further details regarding this process are set forth in representative
independent claim 10 which reads as follows:
10. A continuous process for stabilizing the main flow of bright
beer which comprises:
(a) treating the main flow of said beer with polyvinyl
polypyrrolidone (PVPP), at least 90% by weight of which has a
particle size of at least 10 μm, in an amount between 10 and
100 g/hl of said beer, to allow said PVPP to absorb
polyphenolic material from said beer,
(b) continuously centrifuging the main flow of said thus-treated
beer to simultaneously (1) remove at least 95% of the used
PVPP therefrom in the form of a viscous concentrate paste or
slurry in a beer carrier having a solids content of at least 25%
by weight, and (2) to form a separate flow stream consisting of
the main flow of stabilized beer,
(c) then collecting said used PVPP from said slurry by filtration,
(d) periodically regenerating fresh PVPP from the thus-collected
used PVPP by contacting it with alkali and, after washing,
(e) recycling the regenerated PVPP for reuse in step (a).
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